Roller mill - WikipediaWhen using a four-roller mill to mill grain, the grain first goes through . When using this type of mill on grain, the first set of rollers crush the.roller mill lmka type,DOUBLE PAIR ROLLER MILLS - RMS Roller GrinderIf your ideal micron size is 600-1200 then the RMS double pair mill is the mill for you! . Capacity will vary depending on the material type. Each mill is custom.